Abstract
In the description of quantum key distribution systems, much attention is paid to the operation of quantum cryptography protocols. The main problem is the insufficient study of the synchronization process of quantum key distribution systems. This paper contains a general description of quantum cryptography principles. A two-line fiber-optic quantum key distribution system with phase coding of photon states in transceiver and coding station synchronization mode was examined. A quantum key distribution system was built on the basis of the scheme with automatic compensation of polarization mode distortions. Single-photon avalanche diodes were used as optical radiation detecting devices. It was estimated how the parameters used in quantum key distribution systems of optical detectors affect the detection of the time frame with attenuated optical pulse in synchronization mode with respect to its probabilistic and time-domain characteristics. A design method was given for the process that detects the time frame that includes an optical pulse during synchronization. This paper describes the main quantum communication channel attack methods by removing a portion of optical emission. This paper describes the developed synchronization algorithm that takes into account the time required to restore the photodetectors operation state after the photon has been registered during synchronization. The computer simulation results of the developed synchronization algorithm were analyzed...
Highlights
The main problem associated with confidential information transmission is distribution of the secret key between correspondents
A physical solution of the key distribution problem is known as quantum cryptography, and it is based on the coding of a single particle quantum state
Implementation quantum cryptography is based on quantum key distribution systems
Summary
The main problem associated with confidential information transmission is distribution of the secret key between correspondents. Achieving the ultimate confidentiality during transmission of messages is only possible if the problem of key distribution is solved. A physical solution of the key distribution problem is known as quantum cryptography, and it is based on the coding of a single particle quantum state. The main point of quantum cryptography is reliable distribution of a single key between legitimate users. The idea of quantum cryptography is attractive, as it allows for the creation of an random secret key. Any measurement performed an intruder will cause a change without a disturbance. Any measurement performed by an by intruder will cause a change in the in the information carrier quantum state
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